Any flatwound...Turns out I'm just not a flatwound guy. Horses for courses.
As far as a particular brand, it's good old Rotosound stainless steel rounds. I loved the tone, even though it does die quickly. I didn't mind the rough feel. But the quality control became crap. The last 4 packs I bought had (right out of the plastic) 2 dead strings, 2 dead, 2 dead, and 3 dead. After that, I began searching, and found Daddario Pro Steels and haven't had one complaint. Great tone, not as rough on the fingers, longer lasting, cheaper, and NO DEAD STRINGS.
As far as a particular brand, it's good old Rotosound stainless steel rounds. I loved the tone, even though it does die quickly. I didn't mind the rough feel. But the quality control became crap. The last 4 packs I bought had (right out of the plastic) 2 dead strings, 2 dead, 2 dead, and 3 dead. After that, I began searching, and found Daddario Pro Steels and haven't had one complaint. Great tone, not as rough on the fingers, longer lasting, cheaper, and NO DEAD STRINGS.